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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca2457a539689f717ac63b7ae7e32656be3305233f516243f09d987ae629c46' 
  AND token = 'lcG/AQWb3/tr2YTcMkRUmWNicRktbnCHVzyHT/5a+NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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