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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f05133bc47b86de388ae3029dc866589809b27a1852ad5b62a8bcd08a3e5bc2' 
  AND token = 'yaz4EfLkYRJe2F4kC7EsdDEMqXrf8HsurIEUF7l7WKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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