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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56607110fc259770ad21785950c3b79a5e21c3ae900a881f8cc8132cb64d737' 
  AND token = 'wS7AXbd2pfUwsoeHeU7adaBOrgYHepfVefgzupFN/3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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