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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c15292bd3146c71a9c42558814e4876ac9640c857e80ef5b6e224fe92866f9d' 
  AND token = 'nW9upyy/6xfAJsvXu6suy2Y7/O4yES65yTMZTuzYlks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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