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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ca96c5e874527b1ebc62cdebf6fecc285a3dd7ce4036a9e2cbd2652e1b4708' 
  AND token = 'qMJoff9mk1kIB0lODuMB3JVwgbXPA6ECn8jEkvWzsx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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