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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40d2a7a8385450774a182eee06e8893d34c575ee66c309b07b8a9b6035436de' 
  AND token = 'm44tp8RIwJpC/I/o2tqaUvUOSVSpao0shNjMN4i4TPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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