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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f96bf14884325d0a255057ad0d6d7731aa2576a46366286398db96af7c4279d' 
  AND token = 'Zu28WOrhUOEhYFy1d+kNj74wjo76WR7nXC1UyGtN+mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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