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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ee527ea97b4c4923aa491a0ea3c7df954edd4be924bc5d22b162abb8057a55' 
  AND token = 'KQQrv3oBuTDmDreLBuiJULAs9q6gGfyn1k6PgW2eZBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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