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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf60cccc48469a780534675425a8db2aee4c921163cd6639e8bb60fad0f2baaf' 
  AND token = 'D0SUQjg8jw9LiQOTkK/GFQvQG5G72ExkR2oMz2rfu7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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