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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beec5e95d0647e75107a145f2185fd22437dbc018528b6b407f54f964d4bb3d0' 
  AND token = 'plcuxcxN5An1fcSP/zSy1e6/ihfDOkHnCqth09jsqoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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