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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd6532e9b6ff99ed0ef8842c9cd3292c6c9c8eca95100097e3e17578fda06f3' 
  AND token = 'UzGVtP7Owow/g00a3IopnfbHu3j0YDrpGEZwaRV8EVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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