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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cac69f77d893280ff6f65990fcad306dec48233c3080e97e52fd522dddfadba' 
  AND token = 'h/g66qi93KU/g2kUcVN744BDIAUqI8kMDEqMWy1lrFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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