Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91e95c5b134021087e4df11d9fe9983443371d4c6e62745d2d8dc8d0da4f956' 
  AND token = 'TAXGAJ2Cyj3gEeIVWusUq9qsmNeFHa27gw76DNlgJmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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