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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df05d1a189512fcc05e70b7d86be787480f2757b86de0a1b19ae9d01d8cb17c' 
  AND token = 'bgx4C58LzSknEJh+YIrF6OItswiY4SMh8xTT7lXYsjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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