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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c576e3d6390dca6fb91677a38fe9a1fd0f876665fb4a307ab1653815e0d927' 
  AND token = 'NRj5GxreW+gv+K2WgAlsWexHRPYlWyEadtOBsKNFn/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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