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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '772f5745f6928e62e92bd91a8f64c7b6af4abe631a1cf878d4c92780f256126f' 
  AND token = 'ZGbNnQz2fWaC41eFyOXy1HMT+g5FqC4hUuJmxJPAU7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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