SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52734a9111b4daf8b36ce8c5f33cb736c02a2e433cc18bd3cfe1d20b0957fb96' 
  AND token = 'U2gRifvCQhvHaunDF47soYYKJlz+UgonZreaMaX9Gcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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