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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49f80f49ce0d9f8e129b35f0f4e53fc0388efc7c44bed059245850eade83662e' 
  AND token = 'TqicHvh933c8tUigkdDah9Rj6XVsf8wKKQrxOuJ5QZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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