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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d40956113ae95ebaa12bc7c63f9ae7fff9b06a6ac9ac69e415fcfd3256801fa' 
  AND token = '6sLa+phVXAhiJHskp5qucwKTi9yzAFQc53O2Epjsnd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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