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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3c9c4c604025ea3ce62a4bd6fa801e1556a4ac3f36d7848deaa3f53e256cde' 
  AND token = 'Djj4QSZ0Wd+xTdZCB4bOMQYM2x6yBTdx4hGoOjf71PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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