SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd59ffb036edef57964aeddf9060e1c214953f838b57235e268ce11be36896dd' 
  AND token = 'bt+PhTwv11XwIgUkpdCH+xG2IEXjlwBbBsV/ONzmpC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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