SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb5347d3c82ec8b68634c6a0427ba91f6fdd45f6d6a55809d628ec22b9d8ba5' 
  AND token = 'eqzhTGJzzBHAaX/+CEk0t3ugaJMYUO5twzXmny5KB0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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