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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09acbd1c530eff676e812931a978c9386dd0c86e5bdad7adca79aab112d2bc8' 
  AND token = 'Mtr4qi6ei5VEB9e3sr2KitV5SQGSkk89hdq69Okqf+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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