SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22244614253c4eb5d164c79dee755fe4e2884367bc8c1cd012333fc340d9ef5' 
  AND token = 'BaLLBi6H+B+oGsdv0oK8xC72EUou/wvahphASJ6LRVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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