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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c2d6c6bfab69862af1a6b3714b6a52912035f29fb74b29bbb5b0454228e6d71' 
  AND token = '/sRUHxcS1M2Yw1WDY19KZ84fx6xWBpA9dhwfwxbx4cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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