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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7d34cf1d87ac471b07574b876e64588218845a1c4f25fca6f8830d8a9a6396' 
  AND token = '0J6lW/zDN1SerhmBNiRHy58RbiqjmBd7+X3uYeDQaMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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