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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05dee952646c7132955b6700f194ef23d69eeb84a7ea6892028697d40372a46a' 
  AND token = 'uBBVa7FAffjL7UbN5WvWYBrPCCt7NCkzg5YKuPGnWak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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