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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09be38116fc7b371652af5cc4cb8acf45b63e60d5e61bd65c9d40670dce4513f' 
  AND token = 'uwF7GEHAwOtquqLWY9jSxn2XRX8T11tBzTUQRj5orms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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