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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd3bb9d73c76f8e5463705efe133053c8df9f32c61ac2913e66e7f31fe71008' 
  AND token = 'VHk+eidoMoMeq33fmSn4QQuM6OIpTnG28DoojjBPHpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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