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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534056db60e3ce1984302c4aa78fe8960e54172a0ba865bc3b49af1dfc20eae2' 
  AND token = 'Y7uuKZo7Tm+4ALtNmogCnLz1xEn8X8vYst9BjCvGIxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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