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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c46c2007879862ef7dd260895445633164928bddec35967a0dd8bb09c1dced' 
  AND token = '5Vnwvz2Q1nKgDKJB1FA5M0EV4xBOYcUAH6VoFT+EdXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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