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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42cb6bde0ac8a730b6b4e66ce17f97156e8099aa89cf83e35fbb440a97d5266d' 
  AND token = '6e9L0lOxoDWNU7lZy24MKJGcDF93TqoCW9C2+HaDRvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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