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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a97d538dd2e13e222a5fb8adbb09b964167352d91f349ab5d229bc3c975bd9' 
  AND token = 'p+GJtoMTq34n6Tui5n4FXSf1HgQW0etatkgiM7FWjro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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