SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dacbdb5b0589f0696baa4ff2788b7256dca414f4ea9cb51a38138fd44979cf70' 
  AND token = 'hqDArKqQxgWmlYf5njylNUG6mmpz02UgQLgtw2C5Wpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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