Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f094e8b9a01f64afd6aa1dbcce81259083621bed9a3c085887ed9298d2074ab' 
  AND token = 'crK9tr6TzRffXsXRWFIlHGHaViks1SgkoqXbplbnuyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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