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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed9742e1b347be4e07f62bb0aa4bb84739ed772a4dc4eb8ab6d1cbcc2396b8f' 
  AND token = 'Coi9GNc1IvUPCjVNiuvD1/9pdjLxoJ7ZlnsmpinHekc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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