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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d156868b4968683369536f969634f1cad954e467426970edd9873acc30823d7' 
  AND token = '4uZUBg4NDMDOxA0mH6ljFbH0X/jPqZJ2duW9kkHNNzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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