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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326c8a1813323e59c0140c95d3c2754cf6ae531c13933e5080fb28601a22ac94' 
  AND token = 'ZhqTn81kyyCkj8X2EdxU4KNgh9BwpgFWdUe7O93P5Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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