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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a43ab632429f8db7b36dcca772f487f0685d347a9fdc0fbafe7fc7de2a957fea' 
  AND token = 'TIJ8gzdmrlX6AA5d9Lbe5nTW7xADKQHKLZNZ9LUoKc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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