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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ccf3c353120d8e1117a2893ac29da23a258ef8f5d29fabfee3d1aca920cfd65' 
  AND token = 'pSzoXVodOeKEJqkIOXdkyYNP5VifAi7TDKVvqe6X6Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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