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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdb78bdb774420bfacf31f1cd60a525144ee8c65a32aab95391b7990997d721a' 
  AND token = '420KnZ5FD4FkwWjVxG4Oj8iMgoAV524Du36URGTgFvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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