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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cfc640a9f355f50fd6a2572e005d8b822aa89e77f346eb743ac306db7c3b295' 
  AND token = 'NGs/2cmxP/emwdTb32PXxFs6Hfk3shs5lJzAzV6g+/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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