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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf08719054bd012cc9f069a248d9797c9776301612bc0c5c090ff750c474f76' 
  AND token = 'ots1v7uvPBZGnpugHG5TS6FBkO2xh6HsZ+n9ccWbOic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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