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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717659ae75f8b180542144ba7f300b79584033d7adfdd792f8e5cb59850e32f3' 
  AND token = 'ykdCVxHLP6miFxTuL4xm7nNPN5bb+vl4VgV18y2gsB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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