SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afbe450f2e73bbe7d6f9cd74870a2de89eb53ab1216884e187d164c423ea3bb5' 
  AND token = 'UZyFyACvPzfUS4Iah6vJpqr8xFOHgubppmOazXMqn/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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