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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f219e7eb9b5ed83fc3deefc912395d920ced80f71a454ae8fea73d4432b841d' 
  AND token = '1AfPTGW6CZlApoqU5ztyQResq9txuq4kUSjlJjPrcHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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