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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc61e0c4ae58df11992aa564a2617d9acb9bcf39815dffa67f4ea54f68e73b4' 
  AND token = 't35cIIAYZEpOGRbP+9YbyatOG5rTh9DZMG/yp4d4nRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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