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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc3edcd94ab63b23e5ca9ec3b16b302dc6b8f047f4608d4596723f7c20c0a36' 
  AND token = '3fGamryOU4PArf2Tu4M97xdyK52TNT5K1XcybCEiOhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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