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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a1c851d96454a93b3f3df472faf2e593a536764d6619336f3f6bf06f6ec1109' 
  AND token = 'N7AFP8S7tHIZn+UgTyG3/9zSuXle18HtZDqeEQuulOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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