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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09f94882ed775ca87e9d0f3cd5e0c1bec96658cb8e31605dbb7e99c136c9c59' 
  AND token = 'bIxOA3U/UgTe6DEiblKkBa7LJT95o4/xW8Ju6GSEaZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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