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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a09ced8567b3f4e45813f23b37f7931f613012231dfc339615c1a69b014d140' 
  AND token = '5RkVuPuO1WlnKFlrU+Ys4no8ZiulOuZLKUaTgEZ2X4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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