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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '333d8cd20a3ba7958cf689d3d18f38414c9c7dd3ce057dafdbadbd4f2bf6e7af' 
  AND token = 'f/szR82JfWche7ZrF5iyW6e/DJY0+fR9961g09orXD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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