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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c2e0f1b740703cda2c26f117f9a4af032c9735ab892741396dfedd76f8c0e9' 
  AND token = 'rmLg7FODnknLW9ZutMlg0Pt0nx158BU/LcW2GH5NphE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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