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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '024935f3814a154815a3371943f72e7e1c3042972ab0795f89c2af133dee84b9' 
  AND token = 'rtKedER4ajhmeds2MpZ8iL/4Zve3yqjDQmFlA3y5Ugw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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