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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d055074c72eebb21c5dfcf470c456c250001e61cf7af856c0254d7bc1e05e02' 
  AND token = 'pXqfmI4di6oZ0RAS4UTEpXh+J611fgdBtJsy6x2BePU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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