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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f684033aeedf133365ea7c7d5bc58a4294a45e403ff3af404d08fe0631d834' 
  AND token = 'whZ45IPs1QdF+VhCs9Bg0dajRaupHjSemNgDDKdHdgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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