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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08396e25a55ec30a805b00ffa9b88eaadbc163dd94f5c73b8bb26c41a05faf87' 
  AND token = '/bSj9saNFYXAK4gj/OIYhrTqZ0eG90PyuCRuJX1wa4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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