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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f21697348349ea5b134fa2ee9ef7f521e586694ed804c082d8712054ed52ad' 
  AND token = 'VoOuImpEB/KhDIFPGO44q2Pdy6ZyU/IeAxtiNA0Doxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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