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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '464025363eb90a4fabfb05923b34cc67725d0a1d99ed681533afcc580509d44e' 
  AND token = 'Huj/D167D8OJigSjiG0MfMyPeVbrYc5Xi1biKUt5sGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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