SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2c7dba295a8a7a4106952ac5d60aea9ab29c77faddb83f49c7d586f201825b' 
  AND token = 'ZYyBjyshnVD7hvtlwLKq/2ZV8WY1KxjtA9R2E3MfDsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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