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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '933fa68ad0a8d3cb53efadc2dffdbef3bb0311281e6b6fc91a9ac12304dc368d' 
  AND token = '7Yi4P7ovlIFdkoqc2uP8xi89ErKnl17gv5pJFj9FtS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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