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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdda35bb126e30a3456815c4f38cb0ef1a743afb740e3952342efe7dfe8c4695' 
  AND token = 'unXhxasrUju3CO+MLgocvShO+z15xgOjXw2oDmlI9EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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