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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ae8116df3c5f10d625af713cc9e1fb2beff29c763a3fa83da1fd3b433549f8' 
  AND token = '4P90piHYlmJSIzwuOT0moalL+YhSVl5NbZNnauMYKsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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