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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd217ae3ae6585060a8b084847816553dff2f48a4f0e64e09655eee7fb10272' 
  AND token = 'lMa6q8gRVbY/WfVs1QqtudBvv6h1Mp8objycq1iwRAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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