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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '458d9c2dd85de6ab29c2fe13878175c2d36f2587ec16cbb6971bd9940230fbcd' 
  AND token = 'iCRATdQF1MM5jiUbA/2ndPDL6pUX2uIrL2RnwcKbDrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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