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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc9e1a7c08f975d9b9b7a1c87927cb22d8b2735c6bdc18b8cbbc2b5d7d85c4a' 
  AND token = 'HNGuFGGoJ6oR9XPvffRyvboVqXGpoPsOkH9omfriAvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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