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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4110ceed01fc4175e3552b743e1c7171464ccc6cc133a6f55e02419b3bf31298' 
  AND token = 'slYL0PrwvzMZ5n0DFRkXwDXj4aY7RnAElO4m/luKDJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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