SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da0f7a3e8b731fb41bd26f7c42165b37c9cbf7fffa92c0e80c78d375967e9b3' 
  AND token = 'UIDJBwf8iIj62T4FDHzxgK1SjaByXmoWuUREGXrGt+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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