SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029cff723f5a0245a1e691ee1fc3d78b0587cc14c3fed7ef1b4fd5360392b9d9' 
  AND token = 'ah2LRDLUZNzvhA/uotouUB4D+r/8BdSxYvsfLFanVb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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