SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06933764c9054d599cbbb5f6c080054f7eba1c614e9078ad87db7fa189b54bf2' 
  AND token = 'wKj74hkzYEmTDCStbSynMslwPXiw8L6eeRBZg9sGf+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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