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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2fb97d98469153c759223b58a924e5a3305537dc69e49c0ff955ac67733341' 
  AND token = 'gb0UMnq8VPC2L0s5arTRBYzpjci5wC9SocID2OMBKrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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