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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7885ce35ccd1da495a28a1cec15ac4462da8ffd7f6e7dd54cfbe9b9d15b70d11' 
  AND token = '5VlPSkncFQiIw46NYTphBYiNM9kfEQdxBFiISkDC5MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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