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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcfd6825c35d6f912cacea9490120b477cb5b6c01b31f2be7b989427ec626f8a' 
  AND token = 'YIzq6TWPhbnU0Atq+/9C2DbPH9hCMyAPOo90WFl2oiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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