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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d04a6007fd334d07b9bebed79aaa473f97ba4c7b91b6f440391283fec62697c' 
  AND token = 'p7+1jU5IlCHVIMSOUUhFjK7vyfE6tC0UhuZMp3pRuvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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