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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '967c867eb11b72375a1e2201a754d9fe56a95222babe068cb73f42e71264b573' 
  AND token = 'DJ+J+iXzB7PdHfqJcqojrqs/Do6xtD/hVj+xyocSO6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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