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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f54a49d57b456648357ab992b23a0788972ab6d872832832e61e3a6462f66e' 
  AND token = '7vq62d43EJR50kP7LGQTruxSbrZ59KZ+qKRSHy1kjJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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