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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8272551714aa1c2ffb1ec9ebf713072c1428930d72af98f24a6f3541acc359d' 
  AND token = 'ye6BT6N5kYdis/yMdVmExB7wBYsceFzPOwWLWaEn8os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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