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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8c7ab2ad93674f064cafd275e58f415263f186eb6e42d73cd084580f632c6c' 
  AND token = '9tzXoiIEgWp+QyRf1A1kXvXpOTyyrN4H1wk9PqA+gpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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