SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77afb28efdc43ba04a9690b22545bdaf7f42086b83fcd268a3b8945b54f1fa1' 
  AND token = 'x1+D/PD5ym/dW15cJzxARpOHW+LyjBepq3bjFgO+zFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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