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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2d9da4563979ead5304f70537e5910fcc2746d772f835113e5371cf5663e5f' 
  AND token = 'tbUbTKRwLxAH+RS6vzUgzSQIU5C4Omvnu7A9O2Wba0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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