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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650dc18745c1999cf80e7a1ac87021922568a3b04428d01e443bccd945a78845' 
  AND token = 'UiWbE5YFORlkS4b7RMe5P08Y97ssrCsQdEW/xUwqGZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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