SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '095240a56f9f3bfa3c525297b06937a99ba19140244a54a843906380476ce33e' 
  AND token = 'nn/gV8krDBvVGQhaPUobJ1aGJXHFN/rS+cgJYU1k3+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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