SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41b2a7d74f83a47411ecc97e5bd54b59874c7b864df3624a20d5815e99c69363' 
  AND token = 'dpOkmDkD24Io6mhgqCpXKuZUSQWwhxfAhawzZyjXqFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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