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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609cd8a81433d8da1f2f82ea3d9b7ef049f9a83d713ca62fd29a614a1cf013bc' 
  AND token = '3exNc5f9B/oTisadTxz7mWqhEBNzfY/yTmhhg5DwFLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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