SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cfdf9026c3471cf56ce4f27d76c9940b543b33400ed94a264b98ebff983b87d' 
  AND token = 'Xbw6V1fZLsimx/wZdf7fVtGP+NUIDnwkKYCpOKK6IOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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