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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '121b77e6ddf37c341bebcaf1349d8cc34dd995014e7e65527f686acc3c88045e' 
  AND token = 'ktPqM9HGZqJdN7kH0mGyZLHm/3taJuSpzOpWzoS9H38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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