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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f259d601ac11e0d0c099b2d02b469ac1f7c66754651edaa256ef72a1e22606' 
  AND token = 'k+s2o30+PUIby0oVpj15xZy5ynxF19P0gQoQmU93iYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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