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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9820b798fdeac262cdc50269cf4e6d8e8de0bbdc54ab732d4b26c3db87b5c7' 
  AND token = '34qUTNSdZ7/EMgN8kO8k9T1ydDmWV5cxG998TyzAu0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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