SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0595b974ec3e938467be5b500025eb49a16cc767702c8ba32ed8aaff7b1bb48b' 
  AND token = 'x+2gqDxZUVxkhFifnL+/q29LtH9zzpLtXpgYuAzUUxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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