SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb67b1d32ccc39d1cd11f4b9230805b64c45a413ec25db03c7f6f882b7b43ba3' 
  AND token = '/CoDUftVc5PwuULIhyfEcU6KZTZG+Tn68JB9YhZuke8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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