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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6990ca1853ab80df78fe83434b299cef56c084c21f783e54d9f854092905ac7' 
  AND token = '1P9Ou4LQsmHJ95wNIL02nZWwke/iihwn4MUxRCI//Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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