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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b439cc718224ba2700a66f592483af9a6bddaf940dc2be477417a816264ebe52' 
  AND token = '9anbBv9BrL3+BLBv5v4A3gqkBVjmH7yWsnOp6esvd/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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