SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ffd69b13f38db37b70deb3397b0e15fc125ffe877ae5a94b38fd47fdab551a' 
  AND token = '1IByFbYqBiLgvaUShZAu/lMhdxTI4FWzedEpJ9nPp+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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