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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dae61206dddd4b8b4ff50922db96319fa9c4a11c0bd79e1b1b97b70eb38c4ce' 
  AND token = 'UVOk2eMJCpWmSLS9hL+YKXijQg+vLOpwbfhMVxniHPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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