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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18f868a85a13c77a5bcdb73af6e348183c799b26dfea8910eefe71777e80c5cf' 
  AND token = 'o8GShnJeuE+kyWlGOfBE9pE8PFzmvuG3RtM1RngE08s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00155

JSON explain

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