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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '706ded6f84d6990718da0d6f9dc359be0d939c5cea9f1de7b599762bf030c909' 
  AND token = 'bx+5PzdJ/BTqN8sISb261iGnJkIZBv+jNwcTQJ6vqPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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