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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717f965c059fe9656b3ce4a1a363a70484d40de88130852fdd866e32f23bfc33' 
  AND token = '2tIT9O/Ahl2sBuaDfDYrqyCSoFkXTdEufPvfpf8YN64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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