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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b79a70925293362ef2ef02d32cd4747877e0a6bab9d9ee41d7030eeb6f9e552f' 
  AND token = 'bOSxhWZvrN/Tpe+cAuQT+bVlRL7QQG59/QjnpqE638A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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