SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51525f60523cf96649329e6fc364d1cb542195ee3705cbd6dbabd62a24183c79' 
  AND token = 'Hv1GySqV+wd4j/MnFEouQPaZjWh6rSmo/IXU6aB1Of0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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