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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f09a6ecb08b5279f13c5c271540a200f7bb123af33e41ee478ff06d741fdd2' 
  AND token = '3xJsdrB/ke6qQjuPJcswGWVw0lEapCJxSHcsT13Jrks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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