SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed27f61031eeba998bf4582a618111bd3f85394159121e0c638c7d9d4d08132' 
  AND token = 'CK4wzetHzDQc1yGKKCpP6uDqLebFqnl8uV+RGrY4/+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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