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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c383dc8c5c34945da068b53360247d0ae5e557c0909f2580da0c36c25a8c3f' 
  AND token = 'V3EFICcVm9Dhy3zMTDN0gfenUgkBB+mw55w8emJP3lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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