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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00977c3ec2a854835640066367008e5f0aeae5190d74abd3e3ab77a4482a5e14' 
  AND token = 'FEFdPAq8QMl9G9qwjCQnBh3dXM/0F3Dw67C/6tT73Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}