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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34cc0df4ab57bce7090e536e2cdcf0e58c9690c58ed36ec7f178455f298b8d95' 
  AND token = 'ZsPr/5uQ5GVmzWWczTibFcAisicOT53T9e2F/L/QvSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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