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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b97e0d15ab9179d605d9998296403675288304f52bbd24844fda168b57bda2' 
  AND token = 'Wt14jhaUaAu7vxIKoO0HTD9FBT8QR4tfKlZRvlurie0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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