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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd555fea85555e87d33cd33e65373b3af8a5a58ccccd320a7942e853e9b14e1' 
  AND token = 'l3o+RqsGnnPvj5o0HzBfO/hkdb3h6P9fSGv3qI51L2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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