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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70b5cfc5625f059d05b572a9695a60cd9384b8b02699f88e0a3929744cf1cf7' 
  AND token = 'MQ5BxU1Ju092olp6n2oVLmz+KmeNS03g7NX4Ehetf20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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