SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4de10fab43cdd21ed7b571f2f406c979dc6f22809d514274e92539fb211399fc' 
  AND token = 'qbasHRdKbFyJUJXA2+7gjEPte4ZunMTGlNBpDXuhz34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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