SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95aaf4df1c68f937ef4ab733c4afd358341e2656e129c1ed1c57d67074edc18e' 
  AND token = 'UxOKrP6iNZUS2jMfMjn/NHA/0hpcKmVUhJzPikEzClg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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