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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c56e8dc61a9744f54c33793d8fea4d86a3bf87391f66595a7747ad70cb1bd0' 
  AND token = 'dXllNaIiZY0SB/tlK4ZlBl25BH040neYXGLqZhiJP5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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