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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df09afe5085ed8c433a00b8ea511ea37ca8b7ed125aa6fb53b6ffb4aaf1208a' 
  AND token = 'NUljQ+3b1OvtjyFn7ep+75DKLjrtX2W81+BVNWttzkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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